Superheater.



UNITED [STATES PATET OFFFICEY' l JULIUs'n. MEISSNER, or Pirrs'une, PENNsYLvmIA.

sUPERrrEA'rER.

Application filed June 14, 1907. Serial No..378,919. Y Y

T o all w72 om it may concer-n: A

Be it known that I, J ULlUs'H. MEIssXER, a citizen of the United States, residing at Pittsburg, in the county of Allegheny and State of Pennsjy'lvania., have invented certain new and useful Imnovements in Superheaters, of which the following is a specification.

AMy invention relates to superheaters for water tube boilers, and has for its objects: t-he provision of a superheater having a free circulation of water and steam; the provision of a superheater wherein the tubes are straight and easily accessible and removable; and the provision of a superheating means adapted to be filled with water and serve as a generator, and in which an effective circulation of water is secured and in which the use of a system of directing valves is avoided. One embodiment of the invention is illustrated in the accompanying drawings, Where- 1n:- Y

Figure 1 is a combined side elevation and longitudinal section through my improved Water tube boiler,

Figure 2 is an enlarged rear elevation of one half of the boiler, the rear casing being broken away to more clearly disclose the parts, 'and Figure 3 is an enlarged front elevation of one half of the boiler, the front casing being broken away to more clearly disclose the parts.

Briey stated, the boiler comprises an upper portion composed of a series of cross shells, connected 1n series by water and steam -tubes of less length than the diameter of the shells, which shells rest on upright stands free of the walls, and a lower portion composed of inclined tubes having headers connected to the cross shells by inclined rising tubes. The cross shells lie between the headers` thus permitting them to be arranged low down and close to the inclined tubes. Referring now to the drawing, 1 are the inclined tubes, and '2, 3, 4 and 5 are the cross shells or drums, which latter communicate with each other by means of the tubes 6, 7 and 8, the tubes 6 heilig below the water line, the tubes S being above the water line, and the tubes 7 being at the normal water line. Referring to Figures 2 ,and 3, it will be seen that the tubes l are arranged in the usual m-annerin a series I of vertical sets, with the members of each of Speecaticn of Letters Patent.

Patented sept. 22, 1908.

-tical 'setsjterminate in a. separate casting 9, which castings taken together constitute the hea-deis 10, which is' a common construction in the art. Each of the sectional castings 9 is connected to oneA of' the end drums by means of a pipe 11, it being understood that the front and rear headers are substantiall the same, with the except-ion that the front header carries an additional receptacle at the top, to be more particularly described hereafter. The boiler is supplied with a feed Water inlet 12 to the drum 2, and a main steam outlet 13 from the. drum 5, together with the other usual boiler accessories, which need notl be described. The ends of the drums 2, 3, 4 and 5 are provided ivith supporting lugs 2A which rest on saddlesy? secured to the vertical beams'3 (FigQ`L2), The water in the drum 5 from xvliiclrftlie steam is taken is much quieter than in the longitudinal drums,

as the Water rising through the front tubes 11 i and progressing rearn'erdlx through the drums 3, 4, and 5 is retardedand loses its violent motion so that verydry team is as-- sured in the rear drum- The Vertical beam 23 in addition to supporting thedrums ree from the furnace walls constitutes side braces for such Walls. As the supporting of the front header 1t) from the drun12 by means of the tubes 11 would thrcivundue strain on these tubes and tend to rotate the drum 2, additional means are supporting the front header in t ie form of a heavy cross bar 34 having its ends secured to the vertical channel bars at the end of the furnace. This bar is engaged by the hooks per end of each of the header sect-ions 9. The boiler is illustrated as provided with a. Meissner grate and automatic feeding mechanism, but it will be understood that any ty e of furnace may be employed. The tulies 5, and `8 are of less length than the diameter of the drums whereby they may be removed through the drums and all of the tubes employed on the boiler are easily accessible for the expansion and removal.

:interposedbetween the series of drums 2, 3, 4 and 5 and the inclined tubes 1, is my superhcater which constitutes an important feature of the invention. The effective heating surface of this superheater is comprised b v the horizontal tubes 15, the inclined tubes 1G parallelingr the tubes 1 and the vertical tubes 17 andmlS, all of which tubes, it

rovided for" '33 integral with the receptacle 19 at the up- 2" soepen lwhich are in fact contiixiations of the seetions 9,.which constitute `thciheader 16, the

interior of su'clr rece )tacles being. separated from the interior of t 1e header sectlons 9 by means of the walls 20. The upper endsof the receptacles' 19 are connected b vY means ot` the pipes 21 and 21 with the drum 5 above the steam line thereof, as indicated in the drawing, and a box 212 is provided at the juncture of such pipes. The rear ends of the tubes -16 are carried by a cross-box 22, while A the rear ends of thc tubes are carried by' a cross box 23. A box 21 is provided in the main steam outlet pipe 13, and the tubes. 1 7 and 18 communicate with such box 24 and the boxes 22 and 23 respectively as shown.

`Valves 25 and 26 are provided on either side ofthe cross box 24 for a purpose to be hereinafter explained. In order that the superlieatersystem may be 'lille-d with water, to act as a generator and to prevent injury to the tubes while steam is being raised, a. pipe 27 is provided extending from the bottom of the drum 5 to the box 22 and provided wit-h a controlling valve 28. Provision is made for draining the water lfrom the system by means of the pipe 29 extend-ing downwardly from the box 22 and terminating in a mud drum 30 provided with theI usual blow-off means. The members 27, 22, 29 and 30 in addition to providing a means for lilling the superhcater with water and afterwards draining it, also constitute a blow-ott' means for the drum 5. The other drums 2, 3 and Ltare also provided with suitable blow-oil pipes 3l.

The operation is as follows. The furnace being ready to start, water is admitted to the superheating system by means of the valve 28 in the pipe 27, which arrangement provides for the protection of the tubes ex osed to a high temperature while. steam is eing raised. At this time the valve 25 in the outlet pipe 13 is open, and the valve 26 is closed, thus providing for the escape into the drum 5 of any steam generated in the boxes 22 and 23, and the pipes 1( and 1S, and to prevent geysering or back pressure and secure a roper circulation of water. The superlieater at this stage constitutes a generator, and the arrangement of the tubes 15, 16 and 18 in the triangular form shown, provides for a vigorous circulation of water in a clock-wise direction, and permits a passage ofthe steam upward through the pipes 16, 21 and 21 to the drum 5, thus materially augmenting t-he main boiler in the generation of steam. steam has been raised in the boiler to the desired pressure, the valve 28 is closed and the water the superheater is allowed to evaporate, orthe superheatcr is emptied by means After of the blowoff connection in the drum 30,

-and the valve 25 closed and the valve 26A opened. "The steam now generated in the system finds its way .to the 'dru 1n 5, and passes outwrhrough the tubes 21`,;box 212 and tubes 21 to the receptacle 19, and. then )asses'through the tubes 15- and`1'6 to the oxes 22 `and 23. passing wtothe box 22, then passes up through the pipes 17 to the box 24, while the steam That portion ofthe steam )assingto the box 23 iirst passes ldownto the ox 22. through the tubes 1S and then up through the pipes 17 to the boxl24, from which it 1s discharged through the mam outlet. pipe 13. The steam 1n lts passage superheated. It will be seen that the steam passingthrough the tubes 15 and 17 is heated to approximately the same extent as the steam passing through thc tubes 16, as the greater length of the combined tubes 15 and 17 compensates for the lower degree of heat to which they are exposed. The circulation of water in the boiler itself, is, commencing with the drum 5, down through the rear tubes 1 1 thence upwards through the inclined tubes 1 to the header 10, then through the pipes 11 to the drum 2, and from there successively to the drums 3, -4 and 5 by means of the tubes 6 and 7, thus completing the circuit. It will be seen that by this circulation, very` little agitation in the. drum5is produced, because of tle passage of the water through the successive drums 2, 3 and 4, and that steam of a drier quality is secured from the rear drum 5, than is the case where the old style drums extending longitudinally of the boiler were used, and in which t-he violent inflow of water from the front head through ,sof

lthrough the pipes 15, 16, 17 and 18 is exposed to the products ol combustion and thoroughly which the steam was taken.

It will be apparent that my superheater construction is an advantageous one from a. constructive standpoint as all of the tubes used for superheating are straight and hence easily handled and replaced, and further that the ends of these tubes are readil accessible in the boxes 21', 22 and 23, ami the receptaele 19, so that such tubes may be removed and replaced in the same'manner that the tubes 1 in the boiler are removed andreplaced. It will also be seen that my superheater requires no system of directing valves for securing the proper circulation of water and steam therethrough, and that the blow-oli' members 27, 29 and 3() also provide for the iilliug of the s vstem with water, thus giving a simple and effective means for securing desired results. 1t will also be seen that the triangular arrangement of the tubes 15,

l l l l i .per '1 layed are positioned at points removed romV the area of the highest temperature,

thus materially increasing their hfe. The

making of the receptacle integral with the header sections also simplifies and cheapens the construction of the superheater, avoiding a multiplication of parts, and giving a means for the attachment of the supporting hooks 23, whereby the weight of the front header and the t-ubes carried thereby may be sup` ported in the most ell'ective manner. It will also be apparent that the super-heating tubes and 16 occupy space ot ierwise unused,

and that the use of this superheater does not 15 necessitate any substantial increase in total height of the boiler. Other advantages incident to my construction will be apparent to those skilled in the art.

Having tbusdeseribed my inv :tion and t2() illustrated its use, what I claim'as new and \.kv v desire to securevby Letters Patent is the following:- 3 l', 1. The combination with a boiler, of a tubular superhcater having the tubes thereof arranged in a vertical plane in the form of a triangle, and means bonnnunieating with the boiler above and below the water line v thereof.

2. The combination with a boiler, of a tubular superheater comprising a set of horizontal tubes and a set of inclined tubes communicating at both ends, together with means whereby the steam from the boiler is passed through the superheater and means for filling the superheater with water from the boiler whereby the superheater may be used as a generator.

3. The combination with a boiler, of a tubular superheater comprising a set of horizon- Y tal tubes and aset of inclined tubes cominunieating at both ends and having such ends adjacent to and accessible from the ends of the boiler, tovether with meanswherebv the steam from the boiler is passed through the superheater and means for filling the superheater with water from the boiler vwhereby the superheater maybe used as a generator.

4. The combination with a boiler having-a steam drum and water tubes, of a. superheater intermediate the drum and water tubes comprising a pair of rear' boxes arranged one above the other, a set of tubes between the said boxes, an outlet therefor, a front box, inclined and substantially horizontal tubes from the front box to the rear lower and rear upper boxes respectively, and

v. 899,080 t Y' 3 an inlet to the front box from the steam drum.

5. 'The combination with a boiler having a. steam drum and water tubes, of asuperheater intermediate the drum and water tubes comprising a pair of rear boxes arranged one above the other, a 'set of tubes between the. said boxes, an outlet for the lower box, a front box, inclined and substantially horizontal tubes from the front box to the rear lower and rear upper boxes respectively, and an inlet to the front box from the steam drum.

' 6. T he. combination with a boiler having a steam drum and water tubes, of a superheater intermediate the drum andv water tubes comprising a pair of rear boxes arranged one above-the other, a set of tubes between the said boxes, an outlet therefor, a front' box, a sct of tubes from the lfront box to one of the rear boxes,'another set of tubes from the front box to the other rear box and an inlet to the front box from the steam drum.

7. In a' boiler having inclined water tubes and a pluralitT of transverse drums, the cornbination of a super-heater intermediate the drums and the water tubes, comprising a air of rear boxes arranged one above the ot er, a set of tubesbetween the two boxes, an outlet therefor, a front box, a set of tubes from the front box to one of the rear boxes, another set of tubes from the front box to the other rear box and a set of tubes extending forwardly from the rear drum over the to )s of the other drums and then down to t e front box.

The combination withva boiler having la steam drum and water tubes, of a superheater comprising the outlet box 24 located above the outlet fine of the furnace, the boxes 22 and 23 located one above the other, the tubes 17 connecting the boxes 22 and 24 and extending across the outlet flue, the tubes 1S connecting the boxes 22 and 23, a. front box, the tubes 15 and 16 connecting such box to the boxes 22 and 23, and connecting tubes from the steam space in the drum to the front box.

In testimony whereof I have hereunto signed my name in the presence of the two subscribed witnesses.

JULIUS H. MEISSNER. Witnesses:

DonRIxG BELLrNGER, Anenwonrn MARTIN. 

